Houdini: Some extractors fail when publishing single frame

[MustafaJafar]

Is there an existing issue for this?

• I have searched the existing issues

Note

I didn't make PR because I didn't check all the product types.
Currently, the problem was reported in Composite and Mantra IFD products.
FYI, Mantra IFD should be removed but that's another issue.

Current Behavior:

Extractor plugins of some product types fail when publishing a single frame.

Expected Behavior:

no failing.

Version

1.0.0

What platform you are running on?

Windows

Steps To Reproduce:

1. publish a single frame in Composting product.

Are there any labels you wish to add?

• I have added the relevant labels to the bug report.

Relevant log output:

No response

Additional context:

No response

[cuID:AY-5903]

[MustafaJafar]

Steps to fix by simply replacing such lines by

        output = instance.data["frames"]
        if isinstance(output, list):
                output = output[0]
        _, ext = splitext(output, [])
        ext = ext.lstrip(".")